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maze.util</FONT>
<BR>
Class ListenerSubject&lt;T&gt;</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>maze.util.ListenerSubject&lt;T&gt;</B>
</PRE>
<DL>
<DT><DT><B>Type Parameters:</B><DD><CODE>T</CODE> - The type of the event objects to be used by the Listeners. Objects
           of this type are passed to each registered Listener when they are
           notified.</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../maze/model/MazeModel.html" title="class in maze.model">MazeModel</A>, <A HREF="../../maze/model/RobotPathModel.html" title="class in maze.model">RobotPathModel</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <A HREF="../../src-html/maze/util/ListenerSubject.html#line.17"><B>ListenerSubject&lt;T&gt;</B></A><DT>extends java.lang.Object</DL>
</PRE>

<P>
Implements the observer design pattern. A ListenerSubject can have Listeners
 registered with it and then notify those Listeners when something happens.
 This class can be extended or instances of it can be created to allow a class
 to have multiple events that can be registered with.
<P>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>2009-05-30</DD>
<DT><B>Author:</B></DT>
  <DD>Luke Last</DD>
<DT><B>See Also:</B><DD><A HREF="../../maze/util/Listener.html" title="interface in maze.util"><CODE>Listener</CODE></A></DL>
<HR>

<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->

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<CODE>private &nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.DelayedNotifier.html" title="class in maze.util">ListenerSubject.DelayedNotifier</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A <code>Runnable</code> which is invoked later on the event queue.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private static&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.ListenerMulticaster.html" title="class in maze.util">ListenerSubject.ListenerMulticaster</A>&lt;<A HREF="../../maze/util/ListenerSubject.ListenerMulticaster.html" title="type parameter in ListenerSubject.ListenerMulticaster">T</A>&gt;</B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A utility class used to join 2 Listeners into one Listener interface.</TD>
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<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#delayedListener">delayedListener</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stores listeners that should be notified in a delayed manner.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;<A HREF="../../maze/util/ListenerSubject.DelayedNotifier.html" title="class in maze.util">ListenerSubject.DelayedNotifier</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#delayedNotifier">delayedNotifier</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This is created when needed.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#listener">listener</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Zero, one, or many listeners.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#pendingNotify">pendingNotify</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stores whether or not a delayed notify Runnable has been created on the
 EventQueue but not yet executed.</TD>
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<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#ListenerSubject()">ListenerSubject</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#addDelayedListener(maze.util.Listener)">addDelayedListener</A></B>(<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;&nbsp;listener)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#addListener(maze.util.Listener)">addListener</A></B>(<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;&nbsp;listener)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Registers a Listener with this subject.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;<A HREF="../../maze/util/ListenerSubject.DelayedNotifier.html" title="class in maze.util">ListenerSubject.DelayedNotifier</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#getDelayedNotifier(T)">getDelayedNotifier</A></B>(<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&nbsp;eventObject)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This allows us to only create a new instance once and then reuse it for
 better performance.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#notifyListeners(T)">notifyListeners</A></B>(<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&nbsp;event)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Notifies all registered listeners.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#removeAllListeners()">removeAllListeners</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes all listeners registered with this subject.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../maze/util/ListenerSubject.html#removeListener(maze.util.Listener)">removeListener</A></B>(<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;&nbsp;listener)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unregisters a Listener with this subject.</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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&nbsp;
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<A NAME="listener"><!-- --></A><H3>
listener</H3>
<PRE>
private <A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt; <A HREF="../../src-html/maze/util/ListenerSubject.html#line.23"><B>listener</B></A></PRE>
<DL>
<DD>Zero, one, or many listeners. Can be null. Multiple listeners form a
 linked list.
<P>
<DL>
</DL>
</DL>
<HR>

<A NAME="delayedListener"><!-- --></A><H3>
delayedListener</H3>
<PRE>
private <A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt; <A HREF="../../src-html/maze/util/ListenerSubject.html#line.28"><B>delayedListener</B></A></PRE>
<DL>
<DD>Stores listeners that should be notified in a delayed manner. Can be null.
<P>
<DL>
</DL>
</DL>
<HR>

<A NAME="pendingNotify"><!-- --></A><H3>
pendingNotify</H3>
<PRE>
private volatile boolean <A HREF="../../src-html/maze/util/ListenerSubject.html#line.34"><B>pendingNotify</B></A></PRE>
<DL>
<DD>Stores whether or not a delayed notify Runnable has been created on the
 EventQueue but not yet executed.
<P>
<DL>
</DL>
</DL>
<HR>

<A NAME="delayedNotifier"><!-- --></A><H3>
delayedNotifier</H3>
<PRE>
private <A HREF="../../maze/util/ListenerSubject.DelayedNotifier.html" title="class in maze.util">ListenerSubject.DelayedNotifier</A> <A HREF="../../src-html/maze/util/ListenerSubject.html#line.39"><B>delayedNotifier</B></A></PRE>
<DL>
<DD>This is created when needed.
<P>
<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<A NAME="ListenerSubject()"><!-- --></A><H3>
ListenerSubject</H3>
<PRE>
public <A HREF="../../src-html/maze/util/ListenerSubject.html#line.17"><B>ListenerSubject</B></A>()</PRE>
<DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="notifyListeners(java.lang.Object)"><!-- --></A><A NAME="notifyListeners(T)"><!-- --></A><H3>
notifyListeners</H3>
<PRE>
public final void <A HREF="../../src-html/maze/util/ListenerSubject.html#line.48"><B>notifyListeners</B></A>(<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&nbsp;event)</PRE>
<DL>
<DD>Notifies all registered listeners. Normal listeners are notified
 Immediately, delayed listeners are notified with a new task on the event
 queue.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>event</CODE> - The event object that should be passed to each registered
           Listener.</DL>
</DD>
</DL>
<HR>

<A NAME="getDelayedNotifier(java.lang.Object)"><!-- --></A><A NAME="getDelayedNotifier(T)"><!-- --></A><H3>
getDelayedNotifier</H3>
<PRE>
private <A HREF="../../maze/util/ListenerSubject.DelayedNotifier.html" title="class in maze.util">ListenerSubject.DelayedNotifier</A> <A HREF="../../src-html/maze/util/ListenerSubject.html#line.69"><B>getDelayedNotifier</B></A>(<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&nbsp;eventObject)</PRE>
<DL>
<DD>This allows us to only create a new instance once and then reuse it for
 better performance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>eventObject</CODE> - This event object is given to the notifier which it
           then passes to the listeners.
<DT><B>Returns:</B><DD>The one and only instance.</DL>
</DD>
</DL>
<HR>

<A NAME="addListener(maze.util.Listener)"><!-- --></A><H3>
addListener</H3>
<PRE>
public final void <A HREF="../../src-html/maze/util/ListenerSubject.html#line.110"><B>addListener</B></A>(<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;&nbsp;listener)</PRE>
<DL>
<DD>Registers a Listener with this subject. The given Listener is not checked
 to see if it already is registered.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - The Listener you would like to add.</DL>
</DD>
</DL>
<HR>

<A NAME="addDelayedListener(maze.util.Listener)"><!-- --></A><H3>
addDelayedListener</H3>
<PRE>
public final void <A HREF="../../src-html/maze/util/ListenerSubject.html#line.128"><B>addDelayedListener</B></A>(<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;&nbsp;listener)</PRE>
<DL>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="removeListener(maze.util.Listener)"><!-- --></A><H3>
removeListener</H3>
<PRE>
public final void <A HREF="../../src-html/maze/util/ListenerSubject.html#line.148"><B>removeListener</B></A>(<A HREF="../../maze/util/Listener.html" title="interface in maze.util">Listener</A>&lt;<A HREF="../../maze/util/ListenerSubject.html" title="type parameter in ListenerSubject">T</A>&gt;&nbsp;listener)</PRE>
<DL>
<DD>Unregisters a Listener with this subject. If the given listener is null or
 not already registered no changes are made.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - The Listener you want to remove.</DL>
</DD>
</DL>
<HR>

<A NAME="removeAllListeners()"><!-- --></A><H3>
removeAllListeners</H3>
<PRE>
public final void <A HREF="../../src-html/maze/util/ListenerSubject.html#line.167"><B>removeAllListeners</B></A>()</PRE>
<DL>
<DD>Removes all listeners registered with this subject.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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